Some plugins are plain good. I tend to forget where they are, and then have to go around hunting for them again. Here's so that I don't have to hunt around for these next time.
ruby script/plugin install exception_notification
ruby script/plugin install tztime
ruby script/plugin install tzinfo_timezone
ruby script/plugin install http://svn.techno-weenie.net/projects/plugins/restful_authentication/
ruby script/plugin install http://svn.pragprog.com/Public/plugins/annotate_models
ruby script/plugin install svn://errtheblog.com/svn/plugins/will_paginate
ruby script/plugin install svn://caboo.se/plugins/court3nay/spider_test
ruby script/plugin install http://terralien.com/svn/projects/plugins/query_trace/
Also
svn propset svn:ignore "*.log" log/
svn propset svn:ignore "ruby_sess*" tmp/sessions/
svn propset svn:ignore "*" tmp/pids/
svn propset svn:ignore "*" tmp/cache/
svn propset svn:ignore "*" tmp/sockets/